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How do I detect when someone shakes an iPhone?
...n selecting this new type instead of the base type in IB, or using it when allocating a view).
In the view controller, you want to set this view to become first responder:
- (void) viewWillAppear:(BOOL)animated
{
[shakeView becomeFirstResponder];
[super viewWillAppear:animated];
}
- (void)...
Calling virtual functions inside constructors
...beas other languages do actually do that. For example in Pascal, memory is allocated for the whole object first, but then only the most-derived constructor is invoked. A constructor must either contain an explicit call to its parent's constructor (which does not have to be the first action - it just...
Difference between InvariantCulture and Ordinal string comparison
...ld days before computers had lowercase letters, the uppercase letters were allocated first and thus had lower values than the lowercase letters added later).
For example, by Ordinal: "0" < "9" < "A" < "Ab" < "Z" < "a" < "aB" < "ab" < "z" < "Á" < "Áb" < "á" < "...
Different results with Java's digest versus external utilities
...irtualization does violate the principle of least surprise and adds costs (allocation and runtime). Other operating systems manage to provide both better 32-on-64 support and better application virtualization with fewer snags/leaky abstractions (try running garbage collecting programs on Wow64, or t...
NSOperation vs Grand Central Dispatch
...ations and NSOperationQueues. These are Cocoa objects, and they need to be allocated and deallocated. In an iOS application that I wrote which renders a 3-D scene at 60 FPS, I was using NSOperations to encapsulate each rendered frame. When I profiled this, the creation and teardown of these NSOperat...
Best way to define private methods for a class in Objective-C
...
@implementation MyClass
id (^createTheObject)() = ^(){ return [[NSObject alloc] init];};
NSInteger (^addEm)(NSInteger, NSInteger) =
^(NSInteger a, NSInteger b)
{
return a + b;
};
//public methods, etc.
- (NSObject) thePublicOne
{
return createTheObject();
}
@end
I'm aware this is an ...
What is the difference between a definition and a declaration?
...scope or function scope is a definition both in C and C++. In C because it allocates storage, and in C++ because it does not have the extern specifier or a linkage-specification. These amount to the same thing, which is what sbi says: in both cases this declaration specifies the object to which all ...
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is no
...it needs to, without giving yourself problems later on, because you hadn't allocated enough time for the process to finish. You can also avoid locking up your program by multi-threading.
– WonderWorker
Jul 2 '15 at 15:57
...
Are JavaScript strings immutable? Do I need a “string builder” in JavaScript?
...ded to the existing value of "immutableString"
The resultant value is then allocated to a new block of memory
"immutableString" object now points to the newly created memory space
Previously created memory space is now available for garbage collection.
...
How to destroy an object?
...to null can work in some cases, as long as nothing else is pointing to the allocated memory.
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